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Cisco Bug: CSCvs32299 - 6821 attempts to establish TLS for SIP but fails to "unknown CA"

Last Modified

Jun 08, 2020

Products (1)

  • Cisco SIP IP Phone Software

Known Affected Releases


Description (partial)

"We use GoDaddy SSL certificated and had an issue with them not being in the factory default trusted CA list for the 7800 and 8800 series models ? this was corrected in 11.2 firmware.  We have a similar issue with the 6821 on 11.2 but it is subtly different.  We can see the phone establish TLS to collect it's templates via HTTPS from (packets 254-259), however when it subsequently attempts to establish TLS for SIP to our SBC on, it fails to ?unknown CA? (see packets 399 to 401).  We use the same CA for all certificates on the domain as can be seen in the detail of the packets (GoDaddy Secure Certificate Authority ? G2) so why is the 6821 accepting the CA for collecting its templates but rejecting the CA for TLS comms with the SBC?"

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